Classification
100 - Philosophy & psychology
333 - Economics of land & energy
52
370 - Education
32
610 - Medicine & health
22
700 - The arts; fine & decorative arts
20
170 - Ethics
9
900 - History & geography
9
363 - Other social problems & services
8
300 - Social sciences
7
320 - Political science
7
140 - Specific philosophical schools
6
500 - Natural sciences & mathematics
6
200 - Religion
5
330 - Economics
5
361 - Social problems & social welfare in general
4
400 - Language
4
301 - Sociology & anthropology
3
340 - Law
3
380 - Commerce, communications & transportation
3
600 - Technology
3
000 - Computer science, information & general works
2
297 - Islam, Babism & Bahai Faith
2
364 - Criminology
2
410 - Linguistics
2
576 - Genetics & evolution
2
620 - Engineering & allied operations
2
800 - Literature & rhetoric
2
120 - Epistemology, causation & humankind
1
150 - Psychology
1
155 - Differential & developmental psychology
1
304 - Factors affecting social behavior
1
306 - Culture & institutions
1
362 - Social welfare problems & services
1
398 - Folklore
1
530 - Physics
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
615 - Pharmacology & therapeutics
1
770 - Photography, photographs & computer art
1
780 - Music
1